ofagent: bye bye br-tun

WIP

Implements: blueprint ofagent-merge-bridges
Change-Id: I21ee1c6d141863182b487e10c7bfe911b1a472ab
ml2: make get_device_details report mac address as well

Change-Id: Icaa26448a370dd75d09e95ed439df5b486a862cf
ofagent: Try to populate LOCAL_OUT table

Change-Id: Ie807d753ff125682cf0791c685f8767b44dde8fd
ofa_neutron_agent: l2pop_network_types

Change-Id: Id5ed1d40c8a4adbaadf88da4e1d497b358def5bb
cleanup local_out stuff

Change-Id: I17df3a5aa919b921f5fd1dfc1efc9d3030703052